Question # 1

B2/2p is the expression of.

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Lenz's law

Magnetic energy

Magnetic energy density

Back emf

A simple device that prevents the direction of current from changing is called.

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Commutator

Rotor

Armature

Detector

Commutator was invented in

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1834

1820

1840

1835

In A.C. inductor behaves as

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Capacitor

Resistor

Commutator

Transistor

The magnitude of back emf:

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Increases with sped of motor

Decreases with speed of motor

Remains same

None of above

DC generator by william Sturgeon in:

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1894

1961

1834

1961

The movement of conductor in magnetic field produces electrical current was discovered in:

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1931

1731

1842

1831

Energy density of an inductor is:

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UM=1/2μ_∘/B²

Um = 2μ_∘/B

UM = 1/2B²/μ_∘

Um = 2B²/μ_∘

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Eddy current is produced when:

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A metal is light in varying magnetic field

A metal is kept in steady magnetic field

A circular coil is placed in a steady magnetic field

A current is passed through a circualr coil

Commentator was invented by

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Henry

Ousted

Maxwell

William sturgeon

When back emf in motor is zero, it draws.

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Zero current

Minimum current

Maximum current

Steady current

Lenz's law presented in

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1834

1934

1826

1836

The illustration of the phenomenon of mutual induction is in the device of

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Transformer

Inductor

A.C. Generator

Ammeter

If force in the direction of velocity of conductor, then induced current is directed,

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Anti clockwise

Clock wise

At equilibrium

None of above

Which of the following converts electrical energy into mechanical energy.

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Transformer

A.C. generator

D.C. generator

D.C. motor

The Direction of induced current is always so as to oppose the change which causes the current, is:

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Faraday's law

Lenz's law

Ohm's law

Kirchhoff' s1ast rule

Energy stored in an inductor is:

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1/2L²I

1/2L²/I

_1/2LI²

1/2LI

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